tree 6a57d648f5f1db23e179cc6f55e22ba1c9c67c32
parent 9ff63179b1b57f3c73fcf668ca68710dcc15ee08
author Peter Collingbourne <peter@pcc.me.uk> 1419985539 +0000
committer Copybara-Service <copybara-worker@google.com> 1599161562 -0700

irgen: modify the ABI to use init guards instead of priority

The new ABI is simpler for use cases such as dynamically loaded packages.

The calling convention for import functions is similar to what go/ssa would
produce if BareInits were cleared. However, simply clearing this flag causes
two additional issues:

 1) We would need to special case the 'init$guard' variable (see
    discussion in https://codereview.appspot.com/78780043/).

 2) The call to __go_register_gc_roots needs to appear in the right
    place, i.e. after the guard check. Making this check appear
    in the right place with non-bare inits seems unreliable at best.

So we keep BareInits set and generate the necessary code manually.

It is still possible to get the old ABI by specifying a path to a gccgo
installation.

Differential Revision: http://reviews.llvm.org/D6804

llvm-svn: 225030
GitOrigin-RevId: d34d92fb9c316a9ccd82989cd89b67143cf3fb8d